4.1 Control/Sense Commands

(1)EVPD (Enable Vital Product Data)

a)If the specification in this bits is zero, the HDD transfers the standard INQUIRY data or the command supported data, mentioned later, to the INIT.

b)If the specification in this bits is one, product information called VPD (vital product data) is transferred to the INIT.

(2)CmdDt (Command Supported Data)

a)If the specification in this bits is zero, the HDD transfers the standard INQUIRY data, mentioned later, to the INIT.

b)If the specification in this bits is one, the HDD transfers the command supported data, mentioned later, to the INIT.

(3)Page code / Operation code

a)When the "EVPD" bits is one, this field specifies that the HDD transfers the kind of the VPD information.

b)If the "EVPD" bit is zero and the "CmdDt" bits is one, this field specifies the operation code (CDB byte 0) of commands generated command supported data.

(4)Transfer Byte Length

Byte 4 of the CDB, the "Transfer Byte Length" field, shows the number of bytes of standard INQUIRY data or VPD information that the application client can receive by this command.

The HDD transfers data with the byte length specified in the "Transfer Byte Length" field, or the byte length in the standard INQUIRY data or VPD information which it is holding, whichever has the smallest number of bytes, to the application client. When zero is specified in the "Transfer Byte Length" field, this command is normally terminated without anything being transferred.

(5)Standard INQUIRY data

Table 4.1 shows the format and contents of the standard INQUIRY data transferred to the INIT by this command if "0" is specified in the "EVPD" and the "CmdDt" bit.

C141-C013

137

Page 141
Image 141
Fujitsu MBC2073RC, MBC2036RC, MBA3300RC, MBA3147RC, MBA3073RC specifications Control/Sense Commands